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1. US20130169329 - Method for locking a delay locked loop

Office
United States of America
Application Number 13529671
Application Date 21.06.2012
Publication Number 20130169329
Publication Date 04.07.2013
Grant Number 08638145
Grant Date 28.01.2014
Publication Kind B2
IPC
H03L 7/06
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
CPC
H03L 7/0812
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
081provided with an additional controlled phase shifter
0812and where no voltage or current controlled oscillator is used
H03L 7/10
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
10for assuring initial synchronisation or for broadening the capture range
Applicants Searles Shawn
Advanced Micro Devices, Inc.
Inventors Searles Shawn
Agents Volpe and Koenig, P.C.
Title
(EN) Method for locking a delay locked loop
Abstract
(EN)

A method and apparatus for synchronizing a delay line to a reference clock includes a delay line that receives a clock input signal based on a reference clock and outputs a delay edge signal according to a control adjustment. An injector receives a first rise edge of the reference clock and in response to a first trigger, sends the clock input signal to the delay line. A synchronizer determines that the rise edge has passed through the delay line, and in response, sends the injector a second trigger to send a next single fall edge of the clock input signal to the delay line. A charge pump determines a timing difference between the delay edge signal and a reference edge signal sent from the injector. The charge pump sends the control signal to the delay line to adjust the delay setting of the delay line based on the timing difference.